uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/misc/gpg-mdp/default.nix

@@ -0,0 +1,44 @@
+{ fetchurl, fetchpatch, lib, stdenv, ncurses, gnupg }:
+
+let version = "0.7.4";
+in stdenv.mkDerivation {
+  # mdp renamed to gpg-mdp because there is a mdp package already.
+  pname = "gpg-mdp";
+  inherit version;
+  meta = {
+    homepage = "https://tamentis.com/projects/mdp/";
+    license = [lib.licenses.isc];
+    description = "Manage your passwords with GnuPG and a text editor";
+  };
+  src = fetchurl {
+    url = "https://tamentis.com/projects/mdp/files/mdp-${version}.tar.gz";
+    sha256 = "04mdnx4ccpxf9m2myy9nvpl9ma4jgzmv9bkrzv2b9affzss3r34g";
+  };
+  patches = [
+    # Pull fix pending upstream inclusion for -fno-common toolchain support:
+    #   https://github.com/tamentis/mdp/pull/9
+    (fetchpatch {
+      name = "fno-common.patch";
+      url = "https://github.com/tamentis/mdp/commit/95c77de3beb96dc7c76ff36d3f3dfb18411d7c54.patch";
+      sha256 = "1j6yvjzkx31b758yav4arhlm5ig7phl8mgx4fcwj7lm2pfvzwcsz";
+    })
+  ];
+  buildInputs = [ ncurses ];
+  prePatch = ''
+    substituteInPlace ./configure \
+      --replace "alias echo=/bin/echo" ""
+
+    substituteInPlace ./src/config.c \
+      --replace "/usr/bin/gpg" "${gnupg}/bin/gpg" \
+      --replace "/usr/bin/vi" "vi"
+
+    substituteInPlace ./mdp.1 \
+      --replace "/usr/bin/gpg" "${gnupg}/bin/gpg"
+  '';
+  # we add symlinks to the binary and man page with the name 'gpg-mdp', in case
+  # the completely unrelated program also named 'mdp' is already installed.
+  postFixup = ''
+    ln -s $out/bin/mdp $out/bin/gpg-mdp
+    ln -s $out/share/man/man1/mdp.1.gz $out/share/man/man1/gpg-mdp.1.gz
+  '';
+}